Commit fa73989f authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller

mlxsw: spectrum: Use a stable ECMP/LAG seed

In order to get a consistent behavior of traffic flows across reboots /
module unload, we need to use the same ECMP/LAG seed.

Calculate the seed by hashing the base MAC of the device. This results
in a seed that is both unique (to avoid polarization) and consistent.
Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4ef6cbe8
...@@ -21,7 +21,7 @@ ...@@ -21,7 +21,7 @@
#include <linux/dcbnl.h> #include <linux/dcbnl.h>
#include <linux/inetdevice.h> #include <linux/inetdevice.h>
#include <linux/netlink.h> #include <linux/netlink.h>
#include <linux/random.h> #include <linux/jhash.h>
#include <net/switchdev.h> #include <net/switchdev.h>
#include <net/pkt_cls.h> #include <net/pkt_cls.h>
#include <net/tc_act/tc_mirred.h> #include <net/tc_act/tc_mirred.h>
...@@ -4227,7 +4227,7 @@ static int mlxsw_sp_lag_init(struct mlxsw_sp *mlxsw_sp) ...@@ -4227,7 +4227,7 @@ static int mlxsw_sp_lag_init(struct mlxsw_sp *mlxsw_sp)
u32 seed; u32 seed;
int err; int err;
get_random_bytes(&seed, sizeof(seed)); seed = jhash(mlxsw_sp->base_mac, sizeof(mlxsw_sp->base_mac), 0);
mlxsw_reg_slcr_pack(slcr_pl, MLXSW_REG_SLCR_LAG_HASH_SMAC | mlxsw_reg_slcr_pack(slcr_pl, MLXSW_REG_SLCR_LAG_HASH_SMAC |
MLXSW_REG_SLCR_LAG_HASH_DMAC | MLXSW_REG_SLCR_LAG_HASH_DMAC |
MLXSW_REG_SLCR_LAG_HASH_ETHERTYPE | MLXSW_REG_SLCR_LAG_HASH_ETHERTYPE |
......
...@@ -13,9 +13,9 @@ ...@@ -13,9 +13,9 @@
#include <linux/socket.h> #include <linux/socket.h>
#include <linux/route.h> #include <linux/route.h>
#include <linux/gcd.h> #include <linux/gcd.h>
#include <linux/random.h>
#include <linux/if_macvlan.h> #include <linux/if_macvlan.h>
#include <linux/refcount.h> #include <linux/refcount.h>
#include <linux/jhash.h>
#include <net/netevent.h> #include <net/netevent.h>
#include <net/neighbour.h> #include <net/neighbour.h>
#include <net/arp.h> #include <net/arp.h>
...@@ -7831,7 +7831,7 @@ static int mlxsw_sp_mp_hash_init(struct mlxsw_sp *mlxsw_sp) ...@@ -7831,7 +7831,7 @@ static int mlxsw_sp_mp_hash_init(struct mlxsw_sp *mlxsw_sp)
char recr2_pl[MLXSW_REG_RECR2_LEN]; char recr2_pl[MLXSW_REG_RECR2_LEN];
u32 seed; u32 seed;
get_random_bytes(&seed, sizeof(seed)); seed = jhash(mlxsw_sp->base_mac, sizeof(mlxsw_sp->base_mac), 0);
mlxsw_reg_recr2_pack(recr2_pl, seed); mlxsw_reg_recr2_pack(recr2_pl, seed);
mlxsw_sp_mp4_hash_init(recr2_pl); mlxsw_sp_mp4_hash_init(recr2_pl);
mlxsw_sp_mp6_hash_init(recr2_pl); mlxsw_sp_mp6_hash_init(recr2_pl);
......
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